The containerless rapid solidification of al - 32 . 7wt % cu eutectic alloy in drop tube is investigated . the " lamellar eutectic - anomalous eutectic " microstructural morphology transition occurs with the decrease of droplet size 采用落管无容器处理技术研究了al - 32 . 7wt cu二元共晶合金在深过冷条件下的快速凝固规律。